Localization of oPRP1 and oPRP2 in ovine placentome on Day 45 of gestation. (A, B) oPRP1 and (C, D) oPRP2 mRNAs were detected by in situ hybridization. (A, C) DIG-labeled anti-sense cRNA probes were used. (B, D) DIG-labeled sense cRNA probes were used. Seven micrometer sections of ovine placentome were hybridized with each probe. Scale bars = 100 μm (main areas in A, B, C and D) and 4 μm (right upper areas in A and C).